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TM 9-2320-312-24-2
Troubleshooting Section
No Verify that the switch for the exhaust brake
The diagnostic module provides a way to alert
the driver if the exhaust particulate filter becomes
is on and verify that the ET status screen reflects
plugged. The module monitors exhaust temperature
this condition. If the ECM is reading the switch
and exhaust back pressure. When the temperature
status change, temporarily connect a test ECM.
or the pressure reaches a predetermined level, the
Repeat this test step. If the problem is resolved
diagnostic module closes a switch that is connected
with the test ECM, reconnect the suspect ECM.
to the ECM at J1/P1:7 input 4 and J1/P1:18 input
If the problem returns with the suspect ECM,
sensor common 1. When the switch is closed the
replace the ECM.
ECM derates the engine and a warning light may be
illuminated. When the engine is derated, the engine
Repair: Perform the following repair:
speed is limited to 1200 rpm and the vehicle speed
is limited to 72 km/h (45 mph). Refer to System
1. Temporarily connect a test ECM.
Operation, Testing and Adjusting, RENR1271 and
Special Instruction, REHS1314, "Johnson Mathey
2. Remove all jumpers and replace all connectors.
CRTdm Interface Software Guide" if a problem is
suspected with the diagnostic module.
3. Recheck the system for active diagnostic
codes.
4. Repeat the test step.
5. If the problem is resolved with the test ECM,
reconnect the suspect ECM.
6. If the problem returns with the suspect ECM,
replace the ECM.
7. Verify that the repair eliminates the problem.
STOP.
g00890690
i01738942
Illustration 103
Exhaust Particulate Filter
Circuit schematic for the diagnostic module
Circuit - Test
SMCS Code: 1091-081
System Operation Description:
Use this procedure under the following situation:
Use this procedure to determine if the circuit for the
diagnostic module is operating correctly.
The following background information is related
to this procedure:
The ECM can use various inputs in a number
of ways. The inputs depend on the parameter
programming. Certain features are available on
several different inputs. When an exhaust particulate
filter is installed, the parameter "PTO Configuration"
is automatically programmed to "Cab Switches".
This parameter cannot be reprogrammed.
Diagnostic Module

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